One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18)(19,25)(20,29)(21,26)(22,31)(23,27)(24,28)(30,32) involution — undirected(9,10)(11,15)(12,14)(13,16)(17,19,23,20)(18,24,27,32)(21,28,22,30)(25,26,29,31)(2,5)(6,8)(9,11,12,16)(10,13,14,15)(17,20,23,19)(18,25,27,29)(21,28,22,30)(24,26,32,31)(10,14)(13,15) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,23,22)(18,26,27,31)(19,28,20,30)(24,29,32,25)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.